Funding for this research was provided by:
National Natural Science Foundation of China (81600058)
Clinical Medical Study Program of Chongqing Medical University (XGFY-2019-040)
Key projects of Chongqing Medical University (XGFY-2019-06)
Received: 16 March 2020
Accepted: 11 June 2020
First Online: 19 June 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of the Second Affiliated Hospital of Chongqing Medical University and the need for informed consent was waived. The data used in this study was anonymised before its use.
: Not applicable.
: The authors declare that they have no conflicts of interests.